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Many Chinese websites have blocked access to the US. It's been that way for many years. These websites include e.g. music file search engines and youtube-like video sites (where there are actually full movies).

As far as I know, facebook wasn't banned until the 2008 Tibet riot, when facebook was used to rally people to anti-government demonstrations.
As said in the summary, a facebook clone, Renren, is extremely popular in China with 150 million users, among other social networking sites such as dating-oriented ones. It has pretty much all the fancy features of facebook plus its own innovations, but it's NOT censored, because i) Most of its users are Chinese. What Chinese government really fears is the connection with foreigners in the case of Facebook and Twitter. Though it sounds paradoxical, most people calling for more democracy and freedom in China are foreigners and Chinese expatriates in western countries, rather than people within China who tend to be rather indifferent. ii) Renren is the product an indigenous company in China. Therefore the government naturally expects that the company is more cooperative and controllable.
LinkedIn is obviously also not banned, because its scope is limited to professional activities. It's not likely that people will use it to promote anti-government demonstrations.
In short, social networking is big business in China and censorship is very selective.

After seeing this video, I'm finally convinced that Chrome OS has absolutely nothing to do with the cause of desktop Linux adoption, except in a technical sense. Another blow to those endless advocates.

Under censorship, most ordinary Chinese had never heard of Xiaobo Liu, until they saw news headlines of the sort "Ministry of Foreign Affairs Condemn Nobel Committee for Interfering with Chinese Politics".

China is trying to spread authoritarianism to the west? You view of the world must be stuck in the era when the Soviets sponsored communist parties in Europe. All China is saying, all the time, is "leave us alone".

Thanks for your elaborate explanation. But from what you said, the worm itself wasn't enough to do all the damage, but a lot of spying was needed to probe the internal operation of the nuclear plant, so the worm could be specifically designed to damage the centrifuge, the steam valves etc.
I'm also thinking about another question. Are there alternatives to Siemens control system, of comparable quality, in operating systems other than Windows? This is the crucial factor deciding the long-term threat of this Siemens-specific worm.